Dave Sinkula

For native types I don't think it makes a difference. For user-defined types I think it may mean the difference (if any) between calling (the default constructor and [probably not in this case?]) the assignment operator and a copy constructor. Real C++ people...?

[QUOTE=aminura]Can somebody please tell what does this function prototype indicate--[CODE]const char* fun( char const *,const char*);[/CODE]Is it some thing like that the return type would always be constant char ?[/QUOTE]It may be more helpful to read [inlinecode]const[/inlinecode] as "read-only". You the programmer are not supposed to be writing to it. …

Some light reading: [url]http://ldeniau.home.cern.ch/ldeniau/html/oopc/oopc.html[/url] :p

Let sleeping threads lie. If you must open a new thread, [thread=35517]refer back to the original[/thread]. But then you might realize that a new thread would be relatively pointless, much like replying to a dead thread.

[QUOTE=Ancient Dragon]use functions in time.h -- [COLOR=Magenta]today()[/COLOR] returns the current date as an integer, number of seconds since 1 Jan 1970 (I think).[/QUOTE]Do you mean [inlinecode]time[/inlinecode] (which returns a [inlinecode]time_t[/inlinecode], by the way)?

It looks like you still have to implement these requirements:[QUOTE=mariposa104]The clas has attributes length and width, [COLOR=Blue]each of which defaults to 1. It has members function that calculate the perimeter and the area of the Rectangle.[/COLOR] It has set and get functions for both length and width. [COLOR=Blue]The set functions …

Look up [url=http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/getfilesize.asp][inlinecode]GetFileSize[/inlinecode][/url]. [code]#include <stdio.h> #include <windows.h> int main(void) { const char FilePath[] = "main.exe"; HANDLE MF = CreateFile(FilePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_READONLY, NULL); if ( MF != INVALID_HANDLE_VALUE ) { DWORD High, Low = GetFileSize(MF, &High); if ( Low != 0xFFFFFFFF ) { printf("Size : High = %lu, …

I thought we went through this already. [url]http://www.daniweb.com/techtalkforums/post106155-6.html[/url] [url]http://www.daniweb.com/techtalkforums/showthread.php?p=106169#post106169[/url] Is this something new and different?

[url=http://groups.google.com/group/comp.lang.c/msg/88ec0cd40f400cb7]FYI[/url]

[code]if(strstr(ch, "hello") == 0)[/code]The return value of [inlinecode]strstr[/inlinecode] is a pointer to the match or a NULL pointer when no match was found. Here you are checking for a NULL pointer, meaning when no match was found, so you would be incrementing your counter at the wrong time. Try this …

It looks like you're trying to use some nonstandard I/O. Compiler/OS?

Another one bitten by scanf. When you enter a number, you generally press [enter], right? That screws things up. [url]http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1044873249&id=1043284392[/url]

Let's use the other thread.

[code]system([COLOR=Blue]"dir/B *.txt >>a.txt"[/COLOR]);[/code]

Do you know how to input a line of text and parse it?

Copying to .NET forum.

Copying to .NET forum.

I'd start by googling for an API on the target and its OS.

I believe [inlinecode]operator>>[/inlinecode] is whitespace delimited, so I'd say something like this. [code]if ( file >> Surname >> Firstname >> Age ) {}[/code][edit]Or maybe with [inlinecode]getline[/inlinecode]: [code] if ( file.getline(Surname, sizeof Surname, ' ') && file.getline(Firstname, sizeof Firstname, ' ') && file >> Age ) {}[/code]

Do this:[code] while ( [COLOR=Blue]infile>>first>>last>>ss>>st_code[/COLOR] ) { for ( int x=0; x<10; x++ ) { if ( st_code==st_codes[x] ) { st_name=st_names[x]; [COLOR=Blue]break;[/COLOR] } } cout<<left<<setw(10)<<first<<left<<setw(12)<<last<<left<<setw(15) <<ss<<left<<setw(10)<<st_code<<left<<setw(10)<<st_name<<endl; outfile<<left<<setw(10)<<first<<left<<setw(12)<<last<<left<<setw(15) <<ss<<left<<setw(10)<<st_code<<left<<setw(10)<<st_name<<endl; }[/code]

Post your attempt. The basics are something like this: [code] static const char delim[] = " \n"; size_t size = 0; char word[10][20], *ptr = strtok(sentence, delim); while ( ptr != NULL ) { strcpy(word[size], ptr); if ( ++size >= sizeof word / sizeof *word ) { break; } ptr …

Possibly. [url]http://www.daniweb.com/techtalkforums/announcement8-2.html[/url]

[QUOTE=Keyonts]I was wondering how deep an average programmers knowledge has to be to be good with c++. Do most just take for granted that these templates work and dont ask questions.[/QUOTE]IMO, a good programmer must be trained to trust the interface. Design to the interface. Work with the interface. Sometimes …

[QUOTE=bucsoldier03]i have this program trying to read from a file but i keep getting this error message what am i doing i cant figure it out.[/QUOTE]It might be beneficial to post the error message. It might also be beneficial to post the header file.

You need to make room for the numbers on the bottom, I'd guess. And that would mean you'd need to space out your columns: [code] for (int k = 0; k < 20; k++) { if (scaledfrequency[k] >= row) { cout << [COLOR=Blue]" * "[/COLOR]; } else { cout << …

One would be the missing semicolon in "Sequence.h": [code]typedef patient SeqItemType[COLOR=Blue];[/COLOR] [/code]Others are things like returning a pointer from a function that is not declared as returning a pointer.

[QUOTE=free_eagle]I don't know what to do and how to do to improve my programming skills. i really need your help , advice and suggestions... [/quote]One of the best ways may be to hang out here and practice answering others' questions. When you've got that nailed down, you've got something. [QUOTE=free_eagle]Even …

Arrays are zero-based. If you have [inlinecode]T array[10][/inlinecode], it may be indexed from 0-9, not 0-10.

Post an attempt. I'd imagine it might look something like this, though. [code]#include <stdio.h> void print(const int value[10][10]) { int r, c; for ( r = 0; r < 10; ++r ) { for ( c = 0; c < 10; ++c ) { printf("%d", value[r][c]); } putchar('\n'); } putchar('\n'); …

[QUOTE=desertstorm]Or does that automatically do that when I allocate memory to the nodeList[5].[/QUOTE]No, you need to do that. [edit] Except that this won't go far: [inlinecode]sizeof(void)[/inlinecode] -- you need a type to have a size of that type. [/edit] Why the casts on [inlinecode]malloc[/inlinecode]? If you're using C++, why not …

You should be passing a [i]pointer[/i] to the first character of the string.

[QUOTE=bucsoldier03]how do i get to the tutoriols[/QUOTE][url]http://www.daniweb.com/tutorials/forum21.html[/url]

Spaces over tabs -- always.

[inlinecode]cin[/inlinecode] is whitespace delimited, [inlinecode]getline[/inlinecode] is not. A newline is whitespace too. To get rid of an "unwanted" newline, you may consider reading an extra character using the [inlinecode].get()[/inlinecode] member function. Checking the return values of these input functions is always prudent.

[QUOTE=mym]But the problem is that it only works with certain numbers not all the numbers I input.[/QUOTE]I don't suppose you could tell us what working and nonworking values might be? [QUOTE=mym]I would like to know if I am doing anything wrong.[/QUOTE]Your loop checks quotient before it is initialized for one.

As for the `strcat`, this is in the Code Snippets: [Strings: Concatenation](http://www.daniweb.com/code/snippet406.html) [edit]And never use [gets](http://www.eskimo.com/~scs/C-faq/q12.23.html).

I thinking of a number between 223 and 367 -- what is it? [Translation -- do you think you could be a little more specific?]

[QUOTE=imanust]but it print out the stars in the following format:[code]********* ******* ***** *** *[/code][/QUOTE]For me, it prints this:[code]*************** ********** ****** *** *[/code]Why do I point out the distinction? Because the first line has 5 more * than the line below it; that line has 4 more than the line below …

The first one is because it doesn't see any floating point operations, so the library is not linked. [edit][url]http://cboard.cprogramming.com/showthread.php?p=322171#post322171[/url] The second one is not correct.

[url=http://www.cppworld.com/forum/index.php?showtopic=1041&st=0&#entry6838]Same answer[/url] to the same question.

[quote]I would like a little help on how to reset the grid to show the next generation though.[/quote]Like this?[code]void resetgrid(int coordArray[][SIZE2], int row, int col) { int i, j; for ( i = 0; i < row; i++ ) { for ( j = 0; j < col; j++ ) …

[QUOTE=kahaj]Can't get this to compile for some reason. Anyone have an idea what's going on with it?[/QUOTE]Another victim of the "poorly indented code" bug: you have an extra closing [inlinecode]}[/inlinecode] at the end of the file.

johnray31: I believe you are looking for the [url=http://en.wikipedia.org/wiki/Xor_swap_algorithm#C]XOR swap[/url]. So I guess you are being taught by a teacher that is still stuck in decades-old issues. This "save memory" thing was a problem before the 1970's and has been solved by hardware for decades. Unfortunately these old hacks are …

[inlinecode]getchar[/inlinecode] [inlinecode]fopen[/inlinecode] [inlinecode]fclose[/inlinecode] Try Googling "man <functionname>".

[inlinecode]atoi[/inlinecode] needs a pointer to a C-style string. [code]tree.Insert(atoi(b.c_str()));[/code]

This is an array of 20 pointers to [inlinecode]Student[/inlinecode].[code]Student* list[20];[/code]Where do you allocate memory for each of these 20 pointers? Or did you instead mean to make an array of 20 [inlinecode]Student[/inlinecode]s? That would be like this.[code]Student list[20];[/code]But your use of [inlinecode]->[/inlinecode] notation would then need to be changed to …

[QUOTE=winbatch][code]void catch_signal(int sig_num) { [COLOR=Magenta]cout<<"HEY! somebody cancelled me..."<<endl;[/COLOR] exit( 1 ); }[/code][/QUOTE]You shouldn't be putting standard output stuff in a signal handler. Search also for [inlinecode]sig_atomic_t[/inlinecode].

[QUOTE=arun_kumar_c] my doubt is : how can we assign a string constant to a pointer.And when we assign like this is a character array with the name b[] is initialised to "abc"?[/quote]The pointer is assigned the address of an unnamed array which contains the string literal. [QUOTE=arun_kumar_c]and can anyone expalin …

[QUOTE=Cudmore]I simply don't like adding unnecessary headers becasue I don't use 95% of the crap that comes along with them, and it gets compiled with my program anyway...[/QUOTE]Well, uh, no, it doesn't. Is that your only reason? [QUOTE=Cudmore]Can I type cast?[/quote]If there's one thing to avoid when you're new, it's …

This call is missing parameters.[code]printf("Address of x : %X, value : %d" );[/code]"If there are insufficient arguments for the format, the behavior is undefined."